Chapter 111 Standards for prescribing Controlled Substances and Dangerous Drugs, Rule 111.1 Additional Continuing Education Required: Each dentist who is permitted by the Drug Enforcement Agency to prescribe controlled substances shall complete every three years a minimum of two hours of continuing education in the abuse and misuse of controlled substances, opioid prescription practices, and/or pharmacology. This continuing education may be utilized to fill the continuing education requirements of renewal. Effective: 25 December 2016.